Electromagnetic separator.



C. T. HENDERSON.

ELEcTRoMAGNETlcSEHR/noa.

APPLICATION FlLED MAR. 5, 19.15.

Patented Jan. 4, 1916.

CLARK 'T'. HENDERSON, A0E I/IIIAUAUKEE, WIsooNsIiii, AssIGNoR- To THE oU'rnERf HAMMER MEG. co., on MILWAUKEE, WISCONSIN, A CORPORATION OE WISCONSIN.Y

' ELEoT'RoMAeNErIo SEPARATOR.

Patented aan; a, 191e.

Application led March 5, 1915. Serial No. 12,279.-

To aZZ whom it may concern.'

Be it known that I, CLARK T. HENDERSON, a citizen ofthe United States, residing at Milwaukee, in the county of Milwaukee and State of 1Wisconsin, have invented new and useful Improvements in Electromagnetic Separatore, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawing, forming a part of this specification.

This invention relates to improvements in magnetic separators and more particularly to those of the magnetic pulley type.

In practice, the magnetic. pulleys of such separators are commonly provided with electromagnets to produce a magnetic field through which the conveyed material is passed and the electromagnet is so designed and positioned las to concentrate the magnetic field at a. predetermined point in the travel of the conveyed material, namely, that at which the material tends to `leave the conveyer belt. VThis arrangement is generally effective but under certain conditions, as where heavy pieces of magnetic content are encountered, the separation effected is iinsatisfactory.

It is accordingly one of the objects of this invention to provide an improved magnetic separator pulley which will Obviate the above difficulties and others.

Further objects and advantageswill ap` pear hereinafter in connection with the description ofl the accompanying drawing which shows a typical embodiment of the invention. f

Tn the drawing, Figurel is a diagrammatic view of a magnetic separator pulley in operation and Fig. 2 is a diagrammatic sectional view of the separator pulley.

As shown in Fig.-1, the separator com-- prises a suitable conveyerbelt 11 passing over a power pulley 2 and a magnetic pulley 3. I The bulk material acted upon is conveyed from a suitable source such as the chute 4 into a guide 5 and on to the belt 1. As the material passes over the discharge end of 'the conveyer, the non-magnetic material 6 is projected forwardly to a suitable receptacle 7. As above mentioned, however, the magnetic material 8 contained in the mass is retained against .the belt 1 until the same passes out of the magnetic field so that it is deflected from its normal path and vis depositedin a separate receptacle 9.

Referring morefspecifically to Fig. 2, the separator pulley comprises a wheel or shell 10l rotatably mounted on a supporting shaft 11 and an inclosed magnet 12 which is Valso loosely mounted on; said shaft, andindependent of the shell. The electromagnet in' cludes a winding 1 3 which may be connected to an energizing vcircuit in any desired manner, and pole pieces14 and 15, normally disposed substantially horizontally so that the point of maximum field density of themagnet substantially coincides with the point in the travel of the material acted upon at which the material'tends to leave the belt. This arrangement accordingly tends to insureretention ofY the magnetic content of the mass until after the non-magnetic content has been discharged. Moreover, the magnet 12 is pivotallymountedon the shaftll and is provided with a depending weight 16 tion of the pole pieces 14, 15 and thus shift the point of maximum attraction of the magnet. l

TWith the structure described, the position of the magnetic frame tends to remain substantially constant during the separating operation. However, in the event that a heavy or dense mass of magnetic material passesovery the pulley the same will be caught in theV concentrated magnetic field between the magnet poles 14 and 15, and, due to the attendant substantial deciease'in the gap therebetweemwill tend to rotate the lionagnet with the pulley shell 10 vand the elt.

The magnet will `thus be rocked on the vshaft A.ll'so vthat the full magneticv strength is temporarily continued on the magnetic material and thepulley retains the same until the latter is carried olf by the belt. After such discharge of the magnetic mass, the weight 16 again becomes eective to return the frame 12 to normal position. The maximum magnetic force of the Vpulley Yis thusA automatically adjusted to compensate for variations in the character of the material acted upon.-- Furthermore, the manual adjustment of the magnet enables nml the pole pieces thereof to be shifted so that the region of maximum field strength can be set in accordance with the belt speed and attendant variations in the point at which the momentum of the material tends to carry the same away from the pulley.

`What claim as new and desire to secure by Letters Patent is l. An electromagnetic separator pulley provided with movable pole pieces to be moved by magnetic attraction and having means biasing the same toward a. definite position.

2. in an electromagnetic separator, in combination, a shaft, a pulley Wheel rotatable thereon, an electromagnet supported on said shaft independently of said Wheel and having free pivotal movement, and a counter-Weight associated with said electromagnet for balancing the same.

8. In an electromagnetic separator, in combination, a shaft, a pulley Wheel rotata ble thereon, an electromagnet supported on said shaft independently of said Wheel and having free pivotal movement, a counter-Weight associated with said electromagnet to balance the same, and means to shift Copies of this patent may be obtained for said counter-Weight relatively to said electromagnet for varying the balanced position of the latter.

4i. An electromagnetic separator pulley having freely shiftable parts effecting increased magnetic field in a defined region normally circumferentially stationary, said parts automatically shifting to compensate for variations in the character of the magnetic material acted upon.

5. An electromagnetic separator pulley having freely shiftable parts effecting a dense magnetic field in a normally fixed region, said parts automatically shifting to compensate for temporary variations of a predetermined character in the magnetic material acted upon, and means to adjust said parts at Will'to compensate for continued variations of a predetermined character in the magnetic material acted upon.

ln Witness whereof, l have hereunto subscribed my name in the presence of two Witnesses. l

CLARK T. HENDERSON. wWitnesses:

TEKLA BAsT, L. A.' WATsoN.

Washington, D. G. 

